Plasma Dielectric Film Deposition for Carbon-Rich Stable Layers
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Solution Overview
Problem
Conventional methods for depositing dielectric films face challenges in achieving high carbon content and mechanical stability while minimizing oxidation susceptibility, particularly at lower deposition temperatures, which are limited by thermal budgets and result in films prone to carbon depletion and oxidation.
Innovation Solution
A semiconductor processing method involving specific precursor flow rate ratios, particularly a high inert precursor-to-silicon-containing precursor ratio, combined with plasma-enhanced deposition and post-deposition plasma treatment, to form dielectric films with increased carbon content and stability, reducing oxidation susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If higher deposition temperatures are used to improve film stability, then mechanical stability improves, but carbon depletion occurs
Solution Approach 1:
The patent changes the deposition temperature parameter to a lower range (200-400°C) compared to conventional methods, which prevents carbon depletion while still achieving stable films through modified plasma conditions and precursor chemistry
Solution Approach 2:
The patent creates a composite dielectric material containing silicon, carbon, and nitrogen atoms in specific ratios, where the carbon content (20-40 at.%) is maintained through controlled deposition parameters, resulting in a material with both mechanical stability and high carbon content
2Quantity of substance
If lower deposition temperatures are used to preserve carbon content, then carbon content increases, but oxidation susceptibility increases
Solution Approach 1:
The patent uses plasma-enhanced deposition in a controlled atmosphere with specific precursor gases (silane, ammonia, and inert gas) that create an inert environment during deposition, preventing oxidation of the carbon-rich film even at lower temperatures
Solution Approach 2:
The patent modifies multiple parameters including plasma power (100-500 W), pressure (1-100 mTorr), and gas flow rates to optimize the deposition conditions that simultaneously preserve carbon content and prevent oxidation
3Productivity
If plasma power is increased to improve deposition rate, then productivity increases, but carbon content decreases
Solution Approach 1:
The patent optimizes plasma power to a moderate range (100-500 W) that balances deposition rate with carbon incorporation, avoiding the carbon depletion that occurs at higher powers while maintaining reasonable productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces dielectric films with enhanced carbon content, mechanical properties, and reduced oxidation susceptibility, suitable for bonding applications, by maintaining carbon content and mechanical stability during and after deposition.
Implementation Method 1
generating plasma effluents of the silicon-containing precursor, the nitrogen-containing precursor, and the inert precursor
Implementation Method 2
depositing a silicon-containing material on the substrate
Data Source
AI summary
Embodiments include semiconductor processing methods to form dielectric films on semiconductor substrates are described. The methods may include providing a silicon-containing precursor and a nitrogen-containing precursor to a processing region of a semiconductor processing chamber. A substrate may be disposed within the processing region. The methods may include providing an inert precursor to the processing region of the semiconductor processing chamber. The methods may include generating plasma effluents of the silicon-containing precursor, the nitrogen-containing precursor, and the inert precursor. The methods may include depositing a silicon-containing material on the substrate.